title: Brief atonia associated with electroencephalographic paroxysm in an infant with infantile spasms.
abstract: The loss of muscular tone or muscular inhibition associated with sharp waves observed during abnormal tonic posture in a patient with infantile spasms of early onset is described. The latency between the beginning of a sharp wave and the muscular inhibition varied from 30 to 700 msec, and the duration of the inhibition ranged from 100 to 400 msec. These brief muscular inhibitions may sometimes precede tonic seizures, and these phenomena might be noticeable only in the state of steady tonic muscular contraction.
mesh_terms: D004569:Electroencephalography; D004576:Electromyography; D004831:Epilepsies, Myoclonic / Q000503:physiopathology; D006801:Humans; D007223:Infant; D008297:Male; D009119:Muscle Contraction; D009129:Muscle Tonus; D012890:Sleep; D013036:Spasms, Infantile / Q000503:physiopathology*